Taxes (Components Of Income From Continuing Operations Before Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Taxes [Line Items]
Income from continuing operations before income taxes	$ 25,737	$ 24,398	$ 23,538
US Domestic [Member]
Taxes [Line Items]
Income from continuing operations before income taxes	19,352	18,685	18,398
Walmart International [Member]
Taxes [Line Items]
Income from continuing operations before income taxes	$ 6,385	$ 5,713	$ 5,140

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 1(i)

-Article 4

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration